text: // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
  
  // Copyright (C) 2001-2017 Free Software Foundation, Inc.
  //
  // This file is part of the GNU ISO C++ Library.  This library is free
  // software; you can redistribute it and/or modify it under the
  // terms of the GNU General Public License as published by the
  // Free Software Foundation; either version 3, or (at your option)
  // any later version.
  
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  
  // You should have received a copy of the GNU General Public License along
  // with this library; see the file COPYING3.  If not see
  // <http://www.gnu.org/licenses/>.
  
  // 27.7.1.3 Overridden virtual functions
  
  #include <sstream>
  #include <testsuite_hooks.h>
  
  void test02(std::wstringbuf& in, bool pass)
  {
    using namespace std;
    typedef wstreambuf::pos_type pos_type;
    typedef wstreambuf::off_type off_type;
    pos_type bad = pos_type(off_type(-1));
    pos_type p = 0;
  
    // seekpos
    p = in.pubseekpos(0, ios_base::in);
    if (pass)
      VERIFY( p != bad );
  
    p = in.pubseekpos(0, ios_base::out); 
    VERIFY( p == bad );
  
    p = in.pubseekpos(0); 
    if (pass)
      VERIFY( p != bad );
  }
  
  int main() 
  {
    using namespace std;
  
    // movie star, submarine scientist!
    wstringbuf in1(L"Hedy Lamarr", ios_base::in);
    wstringbuf in2(ios_base::in);
    wstringbuf in3(L"", ios_base::in);
    test02(in1, true);
    test02(in2, false);
    test02(in3, false);
    return 0;
  }
  